Comment #1 on issue 3900 by [email protected]: lseries expansion is wrong
http://code.google.com/p/sympy/issues/detail?id=3900

something like this would put it into form

factor(_)
-(-1 + tanh(1))*(x - 1)*(tanh(1) + 1)
i,d=_.as_independent(x)
from sympy.core.mul import _keep_coeff
_keep_coeff(i.expand(),d) # in case i is a Number
(x - 1)*(-tanh(1)**2 + 1)


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